Wonder Tape - Wash away basting tape (Brand may vary)

Double sided adhesive tape.

Can be sewn through without gumming up your needle. Perfect for holding together seams, hems, edges etc. before stitching.

Can be used on clothing; Great for home, sewing or crafting. We like it for "basting" zippers in place. Zippers go in smooth and easy since you don't need to stitch over any pins.

It also works great to keep embroidery hoops from slipping. Just place tape along the sides of the underside of your embroidery hoop, position hoop where desired, stick hoop to project. Then just slide the bottom hoop in place. Your top hoop won't slide! 

See video here